The 4th Marine Division is a reserve division in the United States Marine Corps. It was raised in 1943 for service during World War II, and subsequently fought in the Pacific against the Japanese. Deactivated after the war, the division was re-formed in 1966 and elements of the division deployed during the Gulf War in 1990–1991, as well as during the Iraq War. It is currently the ground combat element of the Marine Forces Reserve and is headquartered in New Orleans, Louisiana, and has units throughout the United States.
3rd Battalion 11th Marines (3/11) is an artillery battalion comprising three firing batteries, a Liaison Unit, and a headquarters battery. The battalion is based at the Marine Corps Air Ground Combat Center Twentynine Palms, California and its primary weapon system is the M777 lightweight howitzer with a maximum effective range of 25 miles. They fall under the 11th Marine Regiment and the 1st Marine Division.
The 1st Tank Battalion was an armor battalion of the United States Marine Corps which was based out of the Marine Corps Air Ground Combat Center Twentynine Palms, California. It last fell under the command of the 1st Marine Division and I Marine Expeditionary Force. The unit was decommissioned in May 2021 as part of the service Force Design 2030 initiative which saw it move away from larger armor formations.
The 1st Marine Logistics Group is a logistics unit of the United States Marine Corps and is headquartered at Marine Corps Base Camp Pendleton, California, with several subordinate elements also located at Marine Corps Air Station Yuma and Marine Corps Air Ground Combat Center Twentynine Palms.
The 25th Marine Regiment is one of two infantry regiments in the 4th Marine Division of the United States Marine Corps. From its headquarters in Fort Devens, Massachusetts, the regiment commands fifteen training centers in nine states throughout the Northeast. These units consist of approximately 3,500 reserve and active duty Marines and are located from Maine to Delaware, West Virginia and as far west as Ohio. The 25th Marines is primarily a cold weather regiment and frequently trains in northern Norway.
The 6th Engineer Support Battalion, is an engineering battalion of the United States Marine Corps Reserve. The battalion is headquartered in Portland, Oregon, and falls under the command of the 4th Marine Logistics Group.
5th Battalion 11th Marines (5/11) is a High Mobility Artillery Rocket System (HIMARS) battalion consisting of four Firing Batteries and a Headquarters Battery. The battalion is stationed at Marine Corps Base Camp Pendleton, California. It is the first active duty HIMARS Unit in the Marine Corps. They fall under the command of the 11th Marine Regiment and the 1st Marine Division. This is the only battalion in the 11th Marine Regiment not using the M777A2 lightweight howitzer.
1st Battalion 14th Marines (1/14) was a reserve artillery battalion comprising three firing batteries and a headquarters battery. The battalion was based in Alameda, California. Its primary weapon system was the M198 Howitzer. It was part of the 14th Marine Regiment of the 4th Marine Division.
1st Battalion, 23rd Marines (1/23) is one of 32 infantry battalions in the United States Marine Corps, and one of only eight battalions found in the reserve. It is located throughout Texas and Louisiana consisting of approximately 1000 Marines and Sailors. They fall under the command of the 23rd Marine Regiment and the 4th Marine Division.
2nd Battalion, 23rd Marines (2/23) is a reserve infantry battalion in the United States Marine Corps located throughout the Western United States consisting of approximately 1000 Marines and Sailors. They fall under the command of the 23rd Marine Regiment and the 4th Marine Division.
3rd Battalion, 24th Marines (3/24) was a reserve infantry battalion in the United States Marine Corps. The battalion was first formed in 1943 for service in the Pacific Theater of Operations during World War II, taking part in a number of significant battles including those at Saipan and Iwo Jima before being deactivated at the end of the war. In the early 1960s, the unit was reactivated as a reserve battalion. It was located throughout the Midwestern United States and consisted of approximately 800 Marines and Sailors. The battalion was part of the 24th Marine Regiment and the 4th Marine Division. Recent operations included tours in Iraq and Afghanistan. On May 19, 2013, the battalion was deactivated (retired) as a part of 2013 Marine Corps Force Restructuring, along with the 24th Marine Regiment. 3/24 personnel were reallocated to 23rd Marine Regiment, with the majority of the companies becoming 3rd Battalion, 23rd Marines.
4th Assault Amphibian Battalion is a mechanized battalion of the United States Marine Corps Reserve. Their primary weapon system is the AAV-P7/A1 Amphibious Assault Vehicle and they are part of the 4th Marine Division of the Marine Forces Reserve. The unit is based out of Tampa, Florida, with subordinate units in Florida, Virginia and Texas.
4th Tank Battalion is an armored battalion of the United States Marine Corps Reserve. Their primary weapon system is the M1A1 Abrams main battle tank and they are part of the 4th Marine Division and Marine Forces Reserve. The unit headquarters is at the Navy and Marine Corps Reserve Center San Diego, California, but other units in the battalion are located throughout the United States. Until the decision to divest the Marine Corps' armor capability, 4th Tank Battalion was the largest tank battalion in the US military with six lettered companies and an H&S Company.
1st Combat Engineer Battalion is a combat engineer battalion of the United States Marine Corps. The unit, nicknamed "The Super Breed", is based at Marine Corps Base Camp Pendleton, California and falls under the command of the 1st Marine Division and the I Marine Expeditionary Force.
2nd Combat Engineer Battalion is a combat engineer battalion of the United States Marine Corps. They are based out of Marine Corps Base Camp Lejeune, North Carolina and fall under the command of the 2nd Marine Division and the II Marine Expeditionary Force.
The 3rd Battalion, 9th Marines (3/9) is an infantry battalion of the United States Marine Corps. Formed during World War I it served until the early 1990s when it was redesignated as 3rd Battalion, 4th Marines (3/4) during a realignment and renumbering of the Marine Corps' infantry battalions, following the deactivation of the 9th Marine Regiment. The 3rd Battalion, 9th Marines was initially a subordinate unit of the 9th Marine Regiment, 3rd Marine Division, but was later operationally transferred to the 1st Marine Division as a subordinate unit of the 7th Marine Regiment where it remained until its redesignation as 3/4.
The 4th Reconnaissance Battalion is a reserve reconnaissance battalion in the United States Marine Corps. It falls under the 4th Marine Division and Marine Forces Reserve.
3rd Combat Engineer Battalion was a combat engineer battalion of the United States Marine Corps, most recently activated from 7 October 2007 to 5 August 2014. 3rd CEB is having a reunion in Neihart, Montana May 19-22 2023 being hosted by Warrior Reunion Foundation.
The 555th Engineer Brigade "Triple Nickel" is a combat engineer brigade of the United States Army based at Joint Base Lewis-McChord, Washington. The brigade is a Corps separate falling directly under I Corps. The 555 numbering was first used in 1947, but the brigade traces its history to a group active under the 1103d designation from 1943 to 1946.
The 14th Brigade Engineer Battalion is a Combat Engineer Battalion of the United States Army based at Joint Base Lewis-McChord, Washington. The battalion is a subordinate unit of the 2nd Stryker Brigade, 2nd Infantry Division, and I Corps. The battalion's official motto is "Gong Mu Ro" and battle cry "Rugged!".
United States Marine Corps 
